Physics
To prevent damage from lightning, lightning conductors are used on tall structures. The lightning conductor

Should be in the form of a vertical rod
Can be of any shape
Should be made of a good conductor but can be of any shape
Should be made of a good conductor like copper with sharp-pointed edges

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Physics
When a pail of water is swung in a vertical circle, the water does not fall out at the top of the loop when the speed is

Below a certain minimum value depending on amount of water in the pail
Below a certain minimum value irrespective of amount of water in the pail
Above a certain minimum value irrespective of amount of water in the pail
Above a certain minimum value depending on amount of water in the pail

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